18Ni(300)

High-Strength

18Ni(300)

300-grade maraging steel; ultra-high strength & toughness.

Chemical Composition (%)

NI18
CO8.5
MO4.8
TI0.5
AL0.05
C0.03

Mechanical Properties

Tensile:≥1930 MPa;Yield:≥1860 MPa;Elong:≥8%

Chinese Standard

AMS 6514

Equivalent Grades

GB 00Ni18Co8Mo5TiAl / 18Ni 300 maraging / UNS K92890

Applications

Tooling, aircraft & rocket components.

Available Forms

Bar, Plate, Sheet

Uses

Nickel/cobalt-base superalloy retaining high strength, creep and corrosion resistance at extreme temperature. Cobalt (≈9%) raises hot corrosion and wear resistance. Used in gas-turbine blades, aero-engine hot sections, combustors and advanced energy systems.

Heat Treatment

Solution treated 1050–1250 °C and aged (≈700–900 °C) to precipitate γ′/γ″ strengtheners; processed via vacuum induction + VAR/ESR for cleanliness.

Precautions

Machining is difficult — use ceramic/PCBN tools, generous coolant and rigid setups. Keep clean (vacuum/inert melting) to avoid inclusions; avoid contamination by low-melting elements.

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